All-sky angular power spectra from cleaned WISE×SuperCOSMOS galaxy number counts

Aiming to extract cosmological information from linear scales of the WISE×SuperCOSMOS photometric redshift catalog, we perform a characterization of the systematic effects associated with stellar content, evidencing the presence of contamination and obscuration. We create an integrated model for these effects (which together we call “usurper contamination”), devise a method to remove both of them simultaneously and show its functionality by applying it to a set of mock catalogs. When administered to WISE×SuperCOSMOS data, our method shows to improve the measurements of angular power spectra on scales ℓ≲15 and the extraction of cosmological parameters therefrom, even though a significant excess of power remains at these scales. When ignoring scales ℓ